Rare, 2.1" Fossil Crayfish (Procambarus) - Green River Formation

This is a rare, well preserved 2.1" fossil crayfish (Procambarus) from the Green River Formation, Kemmerer, Wyoming. This beautiful specimen is the ventral (underside) view and shows the tail, swimmerets, legs and one claw. Under magnification, antennae and other fine details become visible. This really is an interesting and unusual specimen.

Comes with an acrylic stand.

50 million years ago, in the Eocene these fish thrived in Fossil Lake fed by Uinta and Rocky Mtn. highlands. The anoxic conditions at the bottom of Fossil Lake slowed bacterial decomposition, prevented scavengers from disturbing corpses, and most interestingly, suffocated creatures that ventured into the oxygen-starved aquatic layer. The result is a miraculous exhibition of Eocene biota in a subtropical, aquatic community within sycamore forests teeming with creatures such as freshwater stingrays, dog-sized horses, menacing alligators, early flying bats, and one of the first primates.
Procambrus primaevus
Warfield Quarry, Kemmerer, Wyoming
Green River Formation
2.1" crayfish, 5.4 x 5.0" shale
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